Hermit crabs are low-maintenance pets – all you need is a warm tank, table scraps and an assortment of snail shells. As the crabs grow, they inspect abandoned shells to make a new home. But demand for shells in the pet trade could leave wild hermits homeless. Makerbot, the creator of the first 3D printer for consumers, is testing out designs for plastic shells. But will the finicky crabs be impressed? Makerbot CEO Bre Pettis speaks with host Bruce Gellerman.